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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ssa
import "fmt"
// A place that an ssa variable can reside.
type Location interface {
Name() string // name to use in assembly templates: %rax, 16(%rsp), ...
// A Register is a machine register, like %rax.
// They are numbered densely from 0 (for each architecture).
type Register struct {
Num int32
name string
func (r *Register) Name() string {
// A LocalSlot is a location in the stack frame.
// It is (possibly a subpiece of) a PPARAM, PPARAMOUT, or PAUTO ONAME node.
type LocalSlot struct {
N GCNode // an ONAME *gc.Node representing a variable on the stack
Type Type // type of slot
Off int64 // offset of slot in N
func (s LocalSlot) Name() string {
if s.Off == 0 {
return fmt.Sprintf("%s[%s]", s.N, s.Type)
return fmt.Sprintf("%s+%d[%s]", s.N, s.Off, s.Type)
type LocPair [2]Location
func (t LocPair) Name() string {
n0, n1 := "nil", "nil"
if t[0] != nil {
n0 = t[0].Name()
if t[1] != nil {
n1 = t[1].Name()
return fmt.Sprintf("<%s,%s>", n0, n1)